About 1 in 4 F9 4427 flights from Baltimore arrived 15+ minutes late, diverted or cancelled over the past year (23%); 0.8% were cancelled. The typical flight landed 7 minutes early.
F9 4427: BWI → ATL
Scheduled to leave Baltimore at 8:52 a.m. local time. Over the past year it arrived on time 77% of the time (128 flights), worse than other F9 flights on the route at that hour (81%). Last seen in the data Aug 31, 2026.
Month by month
By day of week
| Day | Flights | On time |
|---|---|---|
| Monday | 22 | 73% |
| Tuesday | 18 | — |
| Wednesday | 16 | — |
| Thursday | 19 | — |
| Friday | 19 | — |
| Saturday | 16 | — |
| Sunday | 18 | — |
Why it was late
All flights BWI → ATL · Connecting off F9 4427? Check the risk
Questions
How often is F9 4427 from BWI to ATL late?
Frontier Airlines 4427 from Baltimore, MD to Atlanta, GA arrived 15 or more minutes late, was diverted or was cancelled on 23% of 128 scheduled flights between September 2025 and August 2026. 0.8% were cancelled.
Flight numbers change. Figures cover flights with this airline, number and route only. "Likely range" is the 95% interval for the true on-time rate given the number of flights. This is history, not live status: check Frontier Airlines for today's flight. Method.